Ruby Week 2 Quiz

Name what each of the below is:

a = 1    # => ex. a is a local variable, and is a Fixnum object with value 1
    @a = 2            # => @a is instance vairiable, Fixnum object.
    user = User.new   # => local instance, is an User object.
    user.name         # => instance getter method
    user.name = "Joe" # => instance setter method, set something to String object

How does a class mixin a module?

By inculde a module, and module provides the instance method for that instance object.

What's the difference between class variables and instance variables?

jamesyang124 / rails_week_1_quiz.md

Last active December 26, 2015 13:18

Rails Week 1 Quiz

Why do they call it a relational database?

The database composite by tables and each table relate to other tables via the foreign keys. The tables composite by attribute column and data row to express a collection of data. By the way, primary key is for table itself quering.

What is SQL?

Structural query language. A standard syntax to qurey and operate the database.

There are two predominant views into a relational database. What are they, and how are they different?

Schema is one of the view to describe the data sctructre, data types, another view is the rows in each table to describe a value collection[row] of attributes[column], which is data view.
Data view describes data with its value and attribute name, Schema view desrcibes attributes' types and structure.

jamesyang124 / rails_week_2_quiz.md

Last active December 26, 2015 13:19

Rails Week 2 Quiz

Name all the 7 (or 8) routes exposed by the resources keyword in the routes.rb file. Also name the 4 named routes, and how the request is routed to the controller/action.

  helpers         Http Verb   URI pattern       Controller#action
  posts_path      GET         /posts            post#index
  new_post_path   GET         /posts/new        post#new
  post_path       GET         /posts/:id        post#show
  edit_post_path  GET         /posts/:id/edit   post#edit
                  POST        /posts            post#create
PUT /posts/:id post#update

jamesyang124 / rails_week_3_quiz.md

Last active December 27, 2015 00:09

Rails Week 3 Quiz

What's the difference between rendering and redirecting? What's the impact with regards to instance variables, view templates?

Render only refresh by templates, redirect_to will go the action controller methods. So the instance variables and params will reset by redirect_to, and render will not reset instance variable and params.

If I need to display a message on the view template, and I'm redirecting, what's the easiest way to accomplish this?

  redirect_to @post, notice: 'message'

jamesyang124 / ruby_meta.md

Last active August 1, 2025 02:53

Ruby meta programming

Ruby Metaprogramming Guide

Note: This guide works with Ruby 2.6+ through Ruby 3.x, with modern Ruby 3.x features highlighted where applicable. Core metaprogramming concepts remain consistent across Ruby versions.

This document has been collaboratively updated and modernized through an interactive process with Claude Code, revised with examples, visual diagrams, and Ruby 3.x compatibility.

Ruby Style Guide Notes

https://github.com/JuanitoFatas/ruby-style-guide

Always run the Ruby interpreter with the -w option so it will warn you if you forget either of the rules below!
Use ||= freely to initialize variables.

# set name to Bozhidar, only if it's nil or false

jamesyang124 / friendly_urls.markdown

Created July 31, 2014 20:14 — forked from jcasimir/friendly_urls.markdown

Friendly URLs

By default, Rails applications build URLs based on the primary key -- the id column from the database. Imagine we have a Person model and associated controller. We have a person record for Bob Martin that has id number 6. The URL for his show page would be:

/people/6

But, for aesthetic or SEO purposes, we want Bob's name in the URL. The last segment, the 6 here, is called the "slug". Let's look at a few ways to implement better slugs.

James Yang jamesyang124